How To Clean A Metal Roof On A House. This is to avoid damage to the roof and your body. Most homeowners fail to clean their metal roofs due to insufficient knowledge on how to clean them.
Even at low pressure, a power washer can seriously damage shingles. Clean your roof only after determining that you can safely walk its surface. To clean a metal roof, wait for a dry, overcast day, and make sure you have a partner to help you for safety reasons.
The combination of the wind and the rain rinses and scrubs your surfaces clean over time.
Second either spray your metal roof cleaner on your roof or use your pressure washer with a 40 degree tip( hot water recommended) to remove the contaminants. Spray your roof down with wet & forget. Nine basic steps to clean a metal roof. Once the stain disappears, rinse the roof thoroughly.